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Related Experiment Videos

How mild is mild asthma?

A R Rubinfeld, M C Pain

    Thorax
    |April 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Asthmatic patients need less airway resistance increase for mild chest tightness than previously thought. Even minor symptoms can indicate significant changes in lung function, suggesting limited respiratory reserve.

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    Area of Science:

    • Pulmonary Medicine
    • Respiratory Physiology

    Background:

    • Asthma is a chronic respiratory disease characterized by airway inflammation and hyperresponsiveness.
    • Understanding the early physiological changes in asthma is crucial for timely intervention.

    Purpose of the Study:

    • To determine the threshold of airway resistance increase that triggers the first symptom of chest tightness in asthma.
    • To compare this threshold with previously reported values and assess associated lung function changes.

    Main Methods:

    • Nineteen asthmatic volunteers were subjected to methacholine challenges to identify their symptom threshold.
    • Lung function indices including static lung volumes, forced expiratory volume in one second (FEV1), and airways conductance were measured.

    Main Results:

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    • The airway resistance increase required for symptom detection was at least double that found in studies using external resistive loads.
    • Mild chest tightness was occasionally associated with lung volume increases similar to those seen in severe asthma attacks.

    Conclusions:

    • The sensory threshold for chest tightness in asthma may occur at lower levels of airway resistance than previously estimated.
    • A small increase in airway resistance can lead to significant changes in lung function, indicating a narrow margin of respiratory reserve in some asthmatic individuals.